✅ SOLVED Maybe spark plug related?

[Older The Better]

Was checking an old barn site, and I found two of these items, the first i thought was a random bit of iron but then a second one made me suspicious, about a week later I went back and found a 3rd one and it has what I assume is porcelain in it. I noticed the bit of wire on the second one but it’s obvious on the 3rd…. A cup and porcelain and a wire… has me wondering about spark plug but I really don’t know

 

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[Back-of-the-boat]

I would think a spark plug also, severely corroded.

 

[Tony in SC]

Old 3 piece sparkplugs. The threaded ends were half inch pipe threads.

 

[Older The Better]

Thanks Tony, sorry for the delay busy time of year. Appreciate the help.